audit: fix NULL Pointer dereference at netlink_unicast



Initialize audit_pid and move the position of mutex lock to
prevent sending skb before audit_sock is assigned.

Change-Id: If846ee01133200fe9dc87444449a3b081a8d3032
Signed-off-by: Huang Yiwei <hyiwei@codeaurora.org>

parent 36dc3fac

kernel/audit.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -908,9 +908,9 @@ static int audit_receive_msg(struct sk_buff skb, struct nlmsghdr nlh)
		}
		if (audit_enabled != AUDIT_OFF)
		audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
		mutex_lock(&audit_sock_mutex);
		audit_pid = new_pid;
		audit_nlk_portid = NETLINK_CB(skb).portid;
		mutex_lock(&audit_sock_mutex);
		audit_sock = skb->sk;
		mutex_unlock(&audit_sock_mutex);
		}